He left home ______a cold morning, and I heard that he was coming back _____ the late afternoon.
Can you _____ the meaning (意思) of the sign (标志)?
—________ does your mother go to work? — She often goes there ______ the bus.
The pair of glasses over there ________ cool. Bring ________ to me and let me have a look.
This accident (事故) happened (发生) ________ a winter afternoon.
单词辨音